US7882908B2 - Drill - Google Patents

Drill Download PDF

Info

Publication number
US7882908B2
US7882908B2 US11/149,386 US14938605A US7882908B2 US 7882908 B2 US7882908 B2 US 7882908B2 US 14938605 A US14938605 A US 14938605A US 7882908 B2 US7882908 B2 US 7882908B2
Authority
US
United States
Prior art keywords
cross
drilling head
drill
section
drilling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US11/149,386
Other languages
English (en)
Other versions
US20060032675A1 (en
Inventor
Olaf Koch
Joachim Woerz
Karl-Heinz Hofmann
Werner Britten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of US20060032675A1 publication Critical patent/US20060032675A1/en
Assigned to HILTI AKTIENGESELLSCHAFT reassignment HILTI AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOCH, OLAF, HOFMANN, KARL-HEINZ, WERNER, BRITTEN, WOERZ, JOACHIM
Application granted granted Critical
Publication of US7882908B2 publication Critical patent/US7882908B2/en
Active legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
    • B28D1/146—Tools therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/31—Diamond
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/75—Stone, rock or concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2240/00—Details of connections of tools or workpieces
    • B23B2240/08—Brazed connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2240/00—Details of connections of tools or workpieces
    • B23B2240/16—Welded connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/18—Configuration of the drill point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/40—Flutes, i.e. chip conveying grooves
    • B23B2251/402—Flutes, i.e. chip conveying grooves with increasing depth in a direction towards the shank from the tool tip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/50—Drilling tools comprising cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B23B51/0411—Drills for trepanning with stepped tubular cutting bodies

Definitions

  • the present invention relates to a drill, in particular, for a hammer drill for drilling in stone, concrete and the like and including a stem and a drilling head formed of a hard material and provided, at its first end with at lest one main bit having a tip, and at a second end located opposite the first end with a bottom surface for mounting the drilling head on the stem, and having a plurality of axially extending through-grooves for removing drillings produced during a drilling process.
  • the drilling heads are provided with through-grooves.
  • the through-grooves have, in particular in one-piece drilling heads formed of a hard material, e.g., a hard metal, a constant cross-section over the entire axial extent of the drilling head.
  • a drawback of the drilling heads consists in that upon formation and removal of drillings, the density is changed, which can lead to an impediment to removal of the drillings. Furthermore, with drills having a diameter in the range from 5 to 17 mm in particular, a secondary comminution beneath the bits takes place, with results in very fine drilling dust if the produced drillings are not transferred in the drill helix sufficiently rapidly. The drilling dust causes a large contamination around and outside of bore edges which is highly undesirable, in particular during works in residential areas or offices.
  • U.S. Pat. No. 5,893,688 discloses a drill having a drilling head with a hard metal insert and with helical grooves extending up to the free end surface of the drilling head.
  • this drill an efficient removal of drillings, which are produced during a drilling process, takes place.
  • helical grooves of the drill stem cannot extend up to the free end surface of the drilling head.
  • British patent Publication GB 2075 409A discloses a drill having a drilling head with a hard metal insert and through-grooves are tilted relative to the axial extent of the drill.
  • this drill the removal of the produced drillings is improved in comparison with removal of drillings in a drill having a drilling head with axially extending through-grooves.
  • a secondary comminution still takes place which, as it has been discussed above, is highly undesirable.
  • an object of the present invention is to provide a drill having a one-piece drilling head formed of a hard material and in which the above-discussed drawbacks of the known drill are eliminated.
  • Another object of the present invention is to provide a drill with a one-piece drilling head formed of a hard material and in which an efficient removal of drillings is possible, with simultaneous reduction of secondary comminution.
  • drills with drilling heads in which a cross-section of the through-grooves increases, at least regionwise, in a direction toward the bottom surface of the drilling head.
  • the cross-section differentiation of the through-grooves reduces the flow resistance during removal of the drillings, in particular, during transition into the drill helix. In addition, a more rapid removal of drillings through the through-grooves, prevents the secondary comminution to a most possible extent.
  • the present invention improves the drillings removal in drills even with small diameters from 5 mm and reduces the secondary comminution therein. This is because the increase of the through-groove cross-section acts analogous to a check valve for the originally comminuted drillings so that the produced drillings have a smaller ability to penetrate back under the bits.
  • the particular form of the increase of the through-groove cross-section and, thus, of the shape of the drilling head of the inventive drill advantageously is determined by a desired drilling capacity and/or dependent on the treated component and, thus, dependent on the type and characteristics of the produced drillings.
  • the cross-sectional increase advantageously takes place in the radial direction with respect to the axial extent of the drill and starts at the tangential limiting surfaces of respective through-grooves.
  • the cross-sectional increase takes place additionally or exclusively in the direction of the tangential limiting surfaces of the respective through-grooves.
  • the cross-sectional increase is implemented, e.g., during refining of the drilling heads formed of hard metal.
  • a non-prismatic pressing tool with different upper and lower die cross-sections is used for producing drilling head formed of a hard material, whereby a desired cross-sectional increase is produced.
  • the drilling head can be formed using a metal injection-molding process during which the cross-sectional increase is produced.
  • the transition between the constant cross-section and the increased cross-section of the through-grooves provides a definite wear limit for the drill below which the drilling speed is significantly reduced.
  • the wall friction increases, and the separation of the axial blow force in two, inclined thereto, separated forces unfavorably influences the drilling. This is because the produced, by the drilling head, cone becomes more steep.
  • the tangential transition edge of the cross-section of the through-grooves is spaced from the bottom surface of the drilling head by a distance corresponding to from 10% to 40% of the distance from the tip of the drill head to the bottom surface of the drill head.
  • a through-groove has, regionwise, a constant cross-section that extends from a free end surface of the drilling head in a direction of the bottom surface axially, and a region with an increasing cross-section that also extends in the direction of the bottom surface and that adjoins the transition edge.
  • the cross-section of the through-grooves increases steadily, whereby a large portion of the frictional engagement provides for the check valve function of the through-grooves.
  • the increased cross-section forms, at least regionwise, a substantially conical groove that continuously equalizes the radial difference between the base of the helical groove of the drill and the region of the corresponding through-groove with a constant cross-section.
  • the cross-section of the through grooves increased in a wedge-shaped manner, whereby the check valve function is realized substantially by a form-locking engagement.
  • the through-grooves have, e.g., a first constant cross-section extending from the free end side of the drilling head and up to the tangential transition edge, and a second constant cross-section, which is greater than the first cross-section and which extends from the bottom surface of the drilling head up to the cone-shaped increase of the cross-section.
  • the transition region e.g., steadily changes.
  • the axial extent of the conical cross-section increase lies advantageously in the range from 10% to 60% of the distance between the tip and the bottom surface of the drill head. This embodiment permits to eliminate turbulences in the flow of drillings in the transition region of the through-grooves between their cross-sections to a most possible extent.
  • a stepwise increase of the cross-section of the through-grooves whereby the check valve function of the through-grooves is provided by a large portion of the form-locking engagement.
  • the through-grooves have, e.g., a first constant cross-section extending from the free end side of the drilling head and up to the tangential transition edge, and a second constant cross-section, which is greater than the first cross-section and which extends from the bottom surface of the drilling head up to the stepwise increase of the cross-section.
  • the transition region is formed, e.g., as a shoulder.
  • the axial extent of the stepwise increase of the cross-section lies advantageously within a range from the tip to the bottom surface of the drilling head, whereby turbulences in the stream of the removable drillings in the transitional region between the cross-sections of the through-grooves can be overcome.
  • FIG. 1 a plan view of a drilling head of a drill according to the present invention
  • FIG. 2 a cross-sectional view along line II in FIG. 1 of a first embodiment of a drilling head according to the present invention
  • FIG. 3 a cross-sectional view along line II in FIG. 1 of a second embodiment of a drilling head according to the present invention.
  • FIG. 4 a cross-sectional view along line II in FIG. 1 of a third embodiment of a drilling head according to the present invention.
  • a one-piece drilling head 10 , 20 , 30 which is formed of a hard metal, of a drill 1 is provided at its first end 5 with a main bit having a tip 4 and at least one cutting structure ( 3 ) integral to the one-piece drilling head 10 , 20 , 30 .
  • the drilling head 10 , 20 , 30 has a bottom surface 7 with which the drilling head 10 , 20 , 30 is mounted on a drill stem 8 .
  • the drilling head 10 , 20 , 30 is secured on the drill stem 8 by welding or soldering.
  • the drilling head 10 , 20 , 30 is provided with a plurality of vertically extending through-grooves 11 , 21 , 31 for removing drillings which are produced during a drilling operation.
  • the cross-section of the through-grooves 11 steadily increased from the tangential transition edge 12 toward the bottom surface 7 , so that the depth of the through-grooves 11 increases, starting from the outer circumference of the drilling head 10 .
  • the axial distance “a” between the transition edge 12 and the bottom surface 7 amounts to about 30% of the distance “D” from the tip 4 to the bottom surface 7 .
  • the cross-section of the through-grooves 21 increases in such a way that it has a wedge shape adjacent to the tangential transition edge 22 .
  • the axial distance “b” between the transition edge 22 and the bottom surface 7 amounts to about 40% of the distance “D” from the tip 4 to the bottom surface 7 .
  • the axial extent “c” of the wedge-shaped region 23 corresponds to about 20% of the distance “D” from the tip 4 to the bottom surface 7 .
  • the cross-section of the through-grooves 31 increases in such a way that it has a shoulder adjacent to the tangential transition edge 32 .
  • the axial distance “d” between the transition edge 32 and the bottom surface 7 amounts to about 35% of the distance “D” from the tip 4 to the bottom surface 7 .
  • the axial extent “e” of the wedge-shaped region 33 corresponds to about from 1% to 10% of the distance “D” from the tip 4 to the bottom surface 7 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
US11/149,386 2004-06-09 2005-06-09 Drill Active 2026-05-22 US7882908B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004028099.1 2004-06-09
DE102004028099A DE102004028099A1 (de) 2004-06-09 2004-06-09 Bohrer
DE102004028099 2004-06-09

Publications (2)

Publication Number Publication Date
US20060032675A1 US20060032675A1 (en) 2006-02-16
US7882908B2 true US7882908B2 (en) 2011-02-08

Family

ID=34940106

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/149,386 Active 2026-05-22 US7882908B2 (en) 2004-06-09 2005-06-09 Drill

Country Status (5)

Country Link
US (1) US7882908B2 (de)
EP (1) EP1604793B1 (de)
CN (1) CN1707064A (de)
DE (2) DE102004028099A1 (de)
ES (1) ES2287868T3 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10022845B2 (en) 2014-01-16 2018-07-17 Milwaukee Electric Tool Corporation Tool bit
USD921468S1 (en) 2018-08-10 2021-06-08 Milwaukee Electric Tool Corporation Driver bit
US11161183B2 (en) * 2016-06-30 2021-11-02 Robert Bosch Gmbh Drilling tool
US11638987B2 (en) 2017-12-01 2023-05-02 Milwaukee Electric Tool Corporation Wear resistant tool bit

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060266427A1 (en) * 2005-05-26 2006-11-30 Wyeth Pharmaceuticals. Mixing apparatus
DE102006000221A1 (de) 2006-05-10 2007-11-15 Hilti Ag Hartstoffbohrkopf
DE102006035453A1 (de) * 2006-11-17 2008-05-21 Hilti Ag Bohrwerkzeug mit Hartstoffkopf
DE102007000534A1 (de) 2007-10-19 2009-04-23 Hilti Aktiengesellschaft Schlagbohrwerkzeug
US7861807B2 (en) 2008-12-03 2011-01-04 Black & Decker Inc. Drill bit including one piece cutting head
CN103706823B (zh) * 2014-01-10 2015-12-09 聊城万合工业制造有限公司 一种精镗转台轴向通孔的镗刀
EP3263254A1 (de) 2016-06-28 2018-01-03 HILTI Aktiengesellschaft Bohrkopf
EP3336302A1 (de) 2016-12-16 2018-06-20 HILTI Aktiengesellschaft Bohrer
CN108729849B (zh) * 2018-05-21 2020-10-16 中国水利水电第十工程局有限公司 一种改良式液压凿岩钻机

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116289A (en) * 1977-09-23 1978-09-26 Shell Oil Company Rotary bit with ridges
US4549616A (en) * 1980-04-16 1985-10-29 Hilti Aktiengesellschaft Rock drill
US4848489A (en) * 1987-03-26 1989-07-18 Reed Tool Company Drag drill bit having improved arrangement of cutting elements
US5350261A (en) 1992-03-12 1994-09-27 Mitsubishi Materials Corporation Twist drill
US5553682A (en) 1994-06-04 1996-09-10 Hilti Aktiengesellschaft Rock drill
US5947660A (en) * 1995-05-04 1999-09-07 Seco Tools Ab Tool for cutting machining
US6129162A (en) 1997-06-10 2000-10-10 Hilti Aktiengesellschaft Rock drill
US20020020566A1 (en) * 2000-07-17 2002-02-21 Udo Hauptmann Working tool for a percussion power tool

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116289A (en) * 1977-09-23 1978-09-26 Shell Oil Company Rotary bit with ridges
US4549616A (en) * 1980-04-16 1985-10-29 Hilti Aktiengesellschaft Rock drill
US4848489A (en) * 1987-03-26 1989-07-18 Reed Tool Company Drag drill bit having improved arrangement of cutting elements
US5350261A (en) 1992-03-12 1994-09-27 Mitsubishi Materials Corporation Twist drill
US5553682A (en) 1994-06-04 1996-09-10 Hilti Aktiengesellschaft Rock drill
US5947660A (en) * 1995-05-04 1999-09-07 Seco Tools Ab Tool for cutting machining
US6129162A (en) 1997-06-10 2000-10-10 Hilti Aktiengesellschaft Rock drill
US20020020566A1 (en) * 2000-07-17 2002-02-21 Udo Hauptmann Working tool for a percussion power tool

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10022845B2 (en) 2014-01-16 2018-07-17 Milwaukee Electric Tool Corporation Tool bit
US11161183B2 (en) * 2016-06-30 2021-11-02 Robert Bosch Gmbh Drilling tool
US11638987B2 (en) 2017-12-01 2023-05-02 Milwaukee Electric Tool Corporation Wear resistant tool bit
US11958168B2 (en) 2017-12-01 2024-04-16 Milwaukee Electric Tool Corporation Wear resistant tool bit
USD921468S1 (en) 2018-08-10 2021-06-08 Milwaukee Electric Tool Corporation Driver bit
USD955843S1 (en) 2018-08-10 2022-06-28 Milwaukee Electric Tool Corporation Driver bit

Also Published As

Publication number Publication date
US20060032675A1 (en) 2006-02-16
DE502005001033D1 (de) 2007-08-30
ES2287868T3 (es) 2007-12-16
EP1604793A1 (de) 2005-12-14
EP1604793B1 (de) 2007-07-18
DE102004028099A1 (de) 2005-12-29
CN1707064A (zh) 2005-12-14

Similar Documents

Publication Publication Date Title
US7882908B2 (en) Drill
RU2135331C1 (ru) Корпус сверла
CN101821068B (zh) 包括扩孔器的螺旋钻头及其制造方法
US7832966B2 (en) Drill for making flat bottom hole
KR101188290B1 (ko) 주조 재료 절삭용 드릴링 공구
US6948890B2 (en) Drill having internal chip channel and internal flush channel
EP1679143B1 (de) Bohrwerkzeug
US5553682A (en) Rock drill
KR100771032B1 (ko) 홈 가공 및 윤곽 가공용 절삭 인서트
US7140815B2 (en) Drill for making flat bottom hole
EP1813368A2 (de) Bohrer und Schneideinsatz
US6629805B1 (en) Hard metal drill bit for use on a drill
JP2000084708A (ja) 切り屑を形成する機械加工用の切削チップ
CN101115579A (zh) 深孔钻头
EP0561957A1 (de) Kaltgeschmiedeter bohrmeissel mit zentraler absaugung
CN101003094A (zh) 车削刀片和车刀
US4620822A (en) Flat bottom hole drill
US7740089B2 (en) Drilling tool with a cutting element that is configured as a plate or head
US6431295B1 (en) Rock drill
US8043032B2 (en) Interchangeable tool part for a reamer
US6868924B2 (en) Rock drill
RU2166608C2 (ru) Коронка цельного бурового инструмента
US9415450B2 (en) Tool head and method for machining a metallic workpiece
US5975813A (en) Single flute drill and method of construction
JP2001518021A (ja) 穴あけ工具

Legal Events

Date Code Title Description
AS Assignment

Owner name: HILTI AKTIENGESELLSCHAFT, LIECHTENSTEIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOCH, OLAF;WOERZ, JOACHIM;HOFMANN, KARL-HEINZ;AND OTHERS;SIGNING DATES FROM 20050627 TO 20050628;REEL/FRAME:017719/0754

Owner name: HILTI AKTIENGESELLSCHAFT, LIECHTENSTEIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOCH, OLAF;WOERZ, JOACHIM;HOFMANN, KARL-HEINZ;AND OTHERS;REEL/FRAME:017719/0754;SIGNING DATES FROM 20050627 TO 20050628

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552)

Year of fee payment: 8

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 12